CN115901694A - Method for identifying producing area of amber - Google Patents
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- CN115901694A CN115901694A CN202211336211.3A CN202211336211A CN115901694A CN 115901694 A CN115901694 A CN 115901694A CN 202211336211 A CN202211336211 A CN 202211336211A CN 115901694 A CN115901694 A CN 115901694A
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Abstract
The invention belongs to the technical field of amber detection, and particularly relates to a method for identifying the producing area of amber. The detection steps are as follows: s1, carrying out photoluminescence spectrum test on an amber sample at an excitation wavelength of 405nm, and preliminarily judging the amber production area according to a characteristic peak or wide absorption band result obtained by the test; and S2, respectively carrying out ultraviolet visible diffuse reflection or photoluminescence qualitative test for 1 to 2 times on different results according to the initial judgment result of the S1, and determining the amber production area according to the characteristic peak, absorption band or absorption inflection point result obtained by the test. The method can determine the producing area of the amber by only using common photoluminescence and ultraviolet diffuse reflection equipment, has clear detection results, does not have the condition of unknown judgment caused by overlapping characteristic peaks, and does not need to process data.
Description
Technical Field
The invention belongs to the technical field of amber detection, and particularly relates to a method for identifying the producing area of amber.
Background
Amber, a category of organic fossil formed by resins of coniferae and leguminous plants in the middle generation Chalkbrook to the third generation after thousands of years of geological action, is a classic research object of the regional difference of ancient organisms and the evolution of atmospheric and geological environments. Meanwhile, amber is also an organic gemstone with high cognition and wide acceptance range, and is popular with jade lovers. As mentioned above, the deep knowledge of amber can provide theoretical support for the ancient biology regional differences and the biology and climate evolution process; therefore, the research on the source tracing of the producing area of the amber is the first time work. Furthermore, there has been a correlation between the commercial value of a gemstone and its place of origin. With the further depth of the knowledge of the amber by the jade lovers, the demand for knowing the property of the producing area of the amber is increasing. In view of the above, the source tracing work of amber is to be expanded.
According to the literature, the King Anhuo [1] Wu Wen Jie [2] And the like respectively utilizes Raman (Raman) spectra to compare and differentiate amber produced by Henan Xixia and Liaoning peaches in China and amber produced by Boragi, the dominican republic and Burmese. Wherein, the king emblem pivot [1] In the research process, the laser Raman spectrum is basically consistent although the origin, the age and the shape of the Henan Xixia amber are different from those of the Fushun amber. Gaigalas [3] Iso-royal elegant rose [4] The research teams respectively utilize the stable isotope ratio mass spectrometer to test the stable isotopes of C, D, O and S in the amber or copal resin of a plurality of different producing areas, and a new way is opened up for the source tracing identification of the producing areas of the amber. Rui yellow [5] The identification of amber origins in the China's smooth, burma and Polaro seas was discussed primarily using X-ray photoelectron spectroscopy and liquid chromatography-high resolution mass spectrometry. Meanwhile, many scholars trace the source of the amber in different producing areas such as the Polish sea, the dominican republic, myanmar, liaoning. In addition, qi of Jiangwei [6] And the two-dimensional fluorescence spectrum (excitation light source 365 nm) is utilized to carry out comparative analysis on the blue amber of Munican republic, mexico and Myanmar, and the situation that the best excitation light source, the peak shape and the peak position have certain difference when the blue amber of different producing areas is detected is pointed out. For blue amber productionIn this connection, the applicant of the present invention has invented a method of confirming whether it is blue-amber of the dominican republic or mexico blue-amber by using Photoluminescence (PL) spectrum detection at an excitation wavelength of 405nm, which is under the application number CN202110797549.8, but it is limited to the origin identification of blue-amber. Zhangzhiqing medicine for curing hypertension [7] And the three-dimensional fluorescence spectra of the ambrosia, the dominican republic, mexico, burma and the Chinese Liaoning amber are compared respectively, so that the characteristic luminescence behaviors of the ambrosia in different producing areas are indicated. Patent application No. CN202011171017.5 discloses a method for judging the producing area of amber based on phosphorescence lifetime, which judges the producing area of amber based on phosphorescence lifetime. Although this method is helpful in determining the origin of amber, it requires a fitting function to calculate the phosphorescence lifetime, and the determination process is complicated because the test results are not directly observed.
In conclusion, the source tracing judgment of the prior people on the amber producing area is mostly based on the infrared spectrum, the Raman spectrum and the fluorescence spectrum of the sample and the color characteristics of the fluorescence and phosphorescence of the sample. With regard to the work of tracing the origin of the related amber origin in the early period, the problems still exist mainly as follows: 1) In view of the similar properties of the amber materials in different producing areas and the influence of irradiation, thermal oxidation and the like caused by the long-term contact of the raw amber ore with the external environment, the spectral characteristics of the amber in different producing areas have certain intersection, and great resistance and technical difficulty are brought to the daily tracing judgment of the amber producing areas. 2) Part of detection equipment related in the detection method is not available in most quality supervision laboratories, quality inspection laboratories and scientific research laboratories at present, so that the hardware deficiency of the detection equipment is a short board problem with limited detection capability. Therefore, it is necessary to develop a diversified detection method to solve the common problem.
Reference to the literature
[1] Raman spectroscopy and fluorescence measurements of amber, wang Hui, mineral rock, 1991,11 (2): 80-84.
[2] Laser Raman spectrum characterization of Wuvingjie, wang Yamei amber [ J ] Gem and J Gem, 2014,16 (1): 40-45.
[3]GAIGALAS A,HALAS S.Stable isotopes(H,C,S)and the origin of Baltic amber[J].Geochronometria,2009,33(1):33-36.
[4] The stable isotope is used to trace the producing area of amber, gem and Gem journal, 2013,15 (3): 9-17.
[5] Organic component analysis of Succinum from Huang Rui, chen Qin rain, yu lan, etc. [ J ] academic report of Guilin science university, 2017,37 (2): 280-284.
[6] Fluorescence spectrum characteristics of Qi Jiangwei, nie Shufang, wang Yamei, dominica, mexico and Myanmar blue [ J ] Gem and Gem J, 2017,19 (2): 1-8.
[7] Zhang Zhiqing, jiang Xin, wang Yamei, etc. three-dimensional fluorescence spectrum characteristics of common amber varieties in different producing areas [ J ] Gem and J.Gem 2020,22 (03): 1-11.
Disclosure of Invention
The invention provides a method for identifying the production area of amber in order to overcome the defects of unclear spectral characteristic limit and high requirement on detection equipment in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method of identifying a source of amber, comprising the steps of:
s1, carrying out photoluminescence spectrum test on an amber sample at an excitation wavelength of 405nm, and preliminarily judging the amber production area according to a characteristic peak or wide absorption band result obtained by the test;
and S2, respectively carrying out ultraviolet-visible diffuse reflection or photoluminescence qualitative test for 1-2 times on different results according to the initial judgment result of the S1, and determining the amber producing area according to the characteristic peak, absorption band or absorption inflection point result obtained by the test.
The applicant of the invention finds that the origin tracing of the amber can be completed by utilizing photoluminescence and ultraviolet-visible diffuse reflection equipment commonly used in quality supervision, quality inspection and scientific research laboratories. And the characteristic peaks obtained by the test are clear, and no characteristic peak intersection exists, so that the source tracing identification of a tester on the producing area is facilitated.
More specifically, when the origin of amber origin is preliminarily judged by photoluminescence, and when characteristic peaks or wide absorption bands exist at 444. + -.5 nm and 509. + -.5 nm, burma or Dornica republic origin is judged. Performing an ultraviolet-visible diffuse reflection test on the basis of the above, and determining that the amber origin is the Dornica republic when the amber origin has an absorption peak at 460 +/-5 nm and an absorption band at 495 +/-5 nm or has an absorption peak at 460 +/-5 nm and an absorption inflection point at 495 +/-5 nm; the amber origin was determined to be Burma when there was no absorption peak at 460. + -.5 nm and no absorption band at 495. + -.5 nm, or no absorption peak at 460. + -.5 nm and no absorption inflection point at 495. + -.5 nm.
When the attribution of the production place of amber is preliminarily judged by photoluminescence, when a characteristic peak or a wide absorption band exists at 550 +/-10 nm, the area is judged as the coastal area of the Boragian sea or the production place of Mexico. On the basis, performing a photoluminescence test at an excitation wavelength of 532nm, and determining that the amber production area is a Boragian coastal area when characteristic peaks exist at positions of 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm; when no characteristic peak exists at 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm, the production place cannot be determined, and the photoluminescence spectrum test needs to be carried out again under the excitation wavelength of 785 nm. On the basis, performing photoluminescence test again at 785nm excitation wavelength, and determining that the amber production area is Mexico when characteristic peaks exist at 832 +/-5 nm, 847 +/-5 nm, 850 +/-5 nm, 867 +/-5 nm, 885 +/-5 nm, 897 +/-5 nm and 901 +/-5 nm; when there is no characteristic peak at 832 + -5 nm, 847 + -5 nm, 850 + -5 nm, 897 + -5 nm, and there is a characteristic peak at 885 + -5 nm, 901 + -2 nm, it is determined that the origin of amber is the sea of Boragina.
Preferably, the preliminary determination method of the amber origin in step S1 is:
when characteristic peaks or wide absorption bands exist at 444 +/-5 nm and 509 +/-5 nm, determining as Burma or the dominican republic of China; when there is a characteristic peak or a broad absorption band at 550 ± 10nm, it is judged as a portic coastal region or a mexico habitat.
Among them, the countries or regions related to the coastal producing areas of the porch are mainly russia, ukraine and the like.
Preferably, after determining as the origin of Burma or the Dorniagana republic in step S1, the method for determining the qualitative amber origin by performing the ultraviolet-visible diffuse reflection test comprises the following steps:
when there is an absorption peak at 460 + -5 nm and an absorption band at 495 + -5 nm, or there is an absorption peak at 460 + -5 nm and an absorption inflection point at 495 + -5 nm, it can be determined that the amber origin is the republic of dominican;
the origin of amber was determined to be Burma when there was no absorption peak at 460. + -.5 nm and no absorption band at 495. + -.5 nm, or no absorption peak at 460. + -.5 nm and no inflection point at 495. + -.5 nm.
Preferably, after determining the coastal area of the porpoise sea or the habitat of mexico in step S1, the photoluminescence spectrum test is performed at an excitation wavelength of 532nm, and the determination method is as follows:
when characteristic peaks exist at 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm, determining that the amber production area is a Boragic coastal area; when the characteristic peaks do not exist at the positions of 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm, the production area cannot be determined, and the photoluminescence spectrum test needs to be carried out again at the excitation wavelength of 785 nm.
Wherein, when no characteristic peak exists at 577 + -5 nm, 583 + -5 nm and 630 + -5 nm, the spectral characteristics may be represented by the existence of only the characteristic peak at 630 + -5 nm or the existence of only the inflection point at 630 + -5 nm. When such characteristic peaks appear, the production area cannot be directly determined, and a photoluminescence test needs to be carried out again.
Preferably, the specific determination method for performing the photoluminescence spectrum test again at the excitation wavelength of 785nm comprises:
determining that the producing area of amber is Mexican when there is characteristic peak at 832 + -5 nm, 847 + -5 nm, 850 + -5 nm, 867 + -5 nm, 885 + -5 nm, 897 + -5 nm, 901 + -5 nm;
when there are no characteristic peaks simultaneously present at 832 + -5 nm, 847 + -5 nm, 850 + -5 nm, 897 + -5 nm, and there are characteristic peaks at 885 + -5 nm, 901 + -5 nm, the origin of amber is determined to be the sea of Boragina.
Preferably, in step S1, when the excitation wavelength is 405nm, the collection range of the photoluminescence spectrum is 400-750nm.
Preferably, the collection range of photoluminescence spectra is 400-750nm when the excitation wavelength is 532 nm.
Preferably, the collection range of the photoluminescence spectrum is 700-1000nm when the excitation wavelength is 785 nm.
Furthermore, the applicant of the present invention observed, prior to the design project, that in the prior studies: photoluminescence spectroscopy has been used very widely in the field of materials research. Has important application in the related detection fields of jewelry jades such as diamonds, emerald, red-blue jewels and pearls. However, at present, no report has been found on the research work of applying 405nm, 532nm and 785nm as multiple excitation light sources to develop amber photoluminescence spectra in different producing areas at home and abroad. In view of this, the patent uses photoluminescence spectra with different excitation wavelengths of 405nm, 532nm and 785nm to perform the judgment of tracing the origin of the amber production area by combining with the ultraviolet-visible diffuse reflection spectrum, and provides technical support for the judgment of tracing the origin of the amber production area.
It should be noted that the laser intensity is preferably of a magnitude that does not ablate the amber sample during the test. Amber from different producing areas has different sensitivity to laser. When information is collected, if the energy is too small, the sample information cannot be reflected well. Therefore, it is not suitable to use a uniform laser energy level for all samples.
Preferably, the amber sample diameter is greater than 10 μm.
Preferably, at least one side of the amber sample is flat.
When the ultraviolet and visible diffuse reflection test is carried out, a sample needs to have a flat reflecting surface with a certain size. Otherwise, when signal acquisition is performed, a phenomenon that a signal is weak or even no signal occurs, and a test result is seriously influenced.
Meanwhile, the method is limited to amber jewelry attributes, namely the requirement of no damage to samples in the detection process, so that the detection method is limited to a certain extent. The appearance and the size of part of amber or ornaments are different, and the application of related detection methods has greater limitation. However, the method has less limitation on the appearance of the amber sample, does not damage the amber in the detection process, highly maintains the integrity of the amber sample, and does not damage the commercial value of the amber sample due to the test.
Therefore, the invention has the following beneficial effects:
(1) The method can determine the producing area of the amber only by using common photoluminescence and ultraviolet-visible diffuse reflection equipment, has clear detection results, does not have the condition of unknown judgment caused by overlapping characteristic peaks, and does not need to process data;
(2) The method uses photoluminescence spectra with different excitation wavelengths of 405nm, 532nm and 785nm to combine with ultraviolet visible diffuse reflection spectra to carry out the judgment of the origin tracing of the amber production area, and provides technical support for the judgment of the origin tracing;
(3) The method for judging the source tracing of the amber production place by using the photoluminescence spectrum has the characteristics of accuracy, no damage and rapidness, and can provide universal, convenient and fast directive identification basis for qualitative judgment of the amber production place;
(4) The detection scheme provided by the invention can provide powerful intelligence guarantee for the healthy and stable development of amber circulation and trading markets.
Drawings
FIG. 1 is a photoluminescence spectrum of an amber sample from Burma at an excitation wavelength of 405 nm;
FIG. 2 is a photoluminescence spectrum of an amber sample produced by the republic of dominican at an excitation wavelength of 405 nm;
FIG. 3 is a photoluminescence spectrum of a Russian-produced amber sample at an excitation wavelength of 405 nm;
FIG. 4 is a photoluminescence spectrum of an amber sample from Ukrainian origin at an excitation wavelength of 405 nm;
FIG. 5 is a plot of the photoluminescence spectrum of a sample of amber from the origin of Mexico at an excitation wavelength of 405 nm;
FIG. 6 is a graph of the UV-VIS diffuse reflectance spectrum of an amber sample from the republic of Dornica;
FIG. 7 is a photoluminescence spectrum of a Russian-produced amber sample at an excitation wavelength of 532 nm;
FIG. 8 is a plot of the photoluminescence spectrum of a amber sample from the origin in Mexico at an excitation wavelength of 785 nm;
FIG. 9 is a photoluminescence spectrum of a Russian-produced amber sample at an excitation wavelength of 785 nm;
FIG. 10 is a photoluminescence spectrum of example 1 at an excitation wavelength of 405 nm;
FIG. 11 is a photoluminescence spectrum of example 1 at an excitation wavelength of 532 nm;
FIG. 12 is a photoluminescence spectrum at an excitation wavelength of 785nm for example 1;
FIG. 13 is a photoluminescence spectrum at an excitation wavelength of 405nm for example 2;
FIG. 14 is a graph showing the UV-VIS diffuse reflectance spectrum of example 2.
Detailed Description
The invention is further described with reference to specific examples. Those skilled in the art will be able to practice the invention based on these descriptions. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
The characteristic peaks involved in the method for identifying the producing area of the amber provided by the invention are obtained by measuring a plurality of groups of spectrograms of the amber in the producing area and summarizing the spectrogram:
1) The results of photoluminescence spectra at an excitation wavelength of 405nm were measured on a plurality of sets of amber samples from Burma origin, and are shown in FIG. 1. Under the condition, the related sample has characteristic peaks at 444 +/-5 nm and 509 +/-5 nm.
2) The results are shown in fig. 2 by detecting photoluminescence spectra at an excitation wavelength of 405nm for a plurality of sets of amber samples from the republic of dominican. Under the condition, the related sample has characteristic peaks at 444 +/-5 nm and 509 +/-5 nm.
3) The results are shown in fig. 3 by detecting photoluminescence spectra at 405nm excitation wavelength for several groups of amber samples from russian origins. The sample involved shows a broad absorption band at 550. + -.10 nm under this condition.
4) The results are shown in fig. 4 by detecting photoluminescence spectra at an excitation wavelength of 405nm for a plurality of sets of amber samples from the ukraine origin. The sample involved shows a broad absorption band at 550. + -.10 nm under this condition.
5) The results are shown in fig. 5 by detecting photoluminescence spectra at an excitation wavelength of 405nm for sets of amber samples from the origin of mexico. The sample involved shows a broad absorption band at 550. + -.10 nm under this condition.
6) The results of the detection of the ultraviolet-visible diffuse reflectance spectrum of the amber samples from the republic of dominican are shown in fig. 6. The sample involved has an absorption peak at 460. + -.5 nm and an absorption band or inflection point at 495. + -.5 nm under this condition.
7) The photoluminescence spectrum of amber samples of Russian origin at 532nm excitation wavelength was detected, and the results are shown in FIG. 7. Under the condition, the related sample has characteristic peaks at 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm.
8) The results are shown in fig. 8 by detecting photoluminescence spectra at 785nm excitation wavelength for sets of amber samples from the origin of mexico. Under the condition, the related sample has characteristic peaks at 832 +/-5 nm, 847 +/-5 nm, 850 +/-5 nm, 867 +/-5 nm, 885 +/-5 nm, 897 +/-5 nm and 901 +/-5 nm.
9) The photoluminescence spectrum of the amber samples of Russian origin at 785nm excitation wavelength was detected, and the results are shown in FIG. 9. Under the condition, the related sample has no characteristic peak at 832 +/-5 nm, 847 +/-5 nm, 850 +/-5 nm and 897 +/-5 nm, and has characteristic peaks at 885 +/-5 nm and 901 +/-5 nm.
Combining the test results of the characteristic peaks, the detection steps in examples 1-2 were performed as follows:
1) And (3) detecting the photoluminescence spectrum of the sample to be detected under the excitation wavelength of 405nm, wherein the abscissa of the obtained spectrogram is the wavelength, the unit is nm, and the collection range of the photoluminescence spectrometer is 400-750nm.
2) Judging whether the collected sample is a type A sample, namely Myanmar or dominica commissural and domestic samples, according to whether characteristic peaks or wide absorption bands exist at 444 +/-5 nm and 509 +/-5 nm in the photoluminescence spectrogram obtained in the step 1); from the photoluminescence emission spectrum obtained in step 1), if there is a characteristic peak or a broad absorption band at 550 ± 10nm, it is determined whether the collected sample is a class B sample, i.e., amber produced in the coastal region of porio or amber produced in the coastal region of mexico, where the countries or regions involved in the coastal region of porio are mainly russia and ukraine.
3) Identifying the amber judged as class A in the step 2) by an ultraviolet-visible diffuse reflectance spectrum, and further determining the attributes of the Burma origin or the dominica origin. The abscissa of the obtained ultraviolet-visible diffuse reflection spectrogram is wavelength in nm, and the collection range of a spectrometer is 220-1000nm.
I. If an absorption peak at 460 +/-5 nm and an absorption band at 495 +/-5 nm exist in an ultraviolet-visible diffuse reflection spectrum corresponding to a sample to be detected at the same time, or an absorption peak at 460 +/-5 nm and an absorption inflection point at 495 +/-5 nm exist at the same time, determining that the sample is the attribute of the dominie production area;
II, if the absorption peak at 460 +/-5 nm and the absorption band at 495 +/-5 nm do not exist simultaneously in the ultraviolet visible diffuse reflectance spectrogram of the sample, or the absorption peak at 460 +/-5 nm and the absorption inflection point at 495 +/-5 nm do not exist simultaneously, judging that the sample is the origin property of Burma.
4) And (3) detecting the amber sample judged as B class in the step 2) again by using photoluminescence spectrum under the excitation wavelength of 532nm, wherein the abscissa of the obtained photoluminescence spectrum is the wavelength, the unit is nm, and the collection range of the spectrometer is in the range of 400-750nm.
I. If 3 characteristic peaks at 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm exist in the photoluminescence spectrum corresponding to the sample to be detected, judging that the sample is the attribute of the Boragina;
and II, if 3 characteristic peaks at 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm exist in the photoluminescence spectrum corresponding to the sample to be detected at the same time, marking the sample as a C-type sample, and performing the next step to be detected.
5) Further carrying out photoluminescence spectrum detection on the C-type sample in the step 4 under the excitation wavelength of 785nm, wherein the abscissa of the obtained spectrogram is the wavelength, the unit is nm, and the collection range of a photoluminescence spectrometer is 700-1000nm.
I. If 7 characteristic peaks at 832 +/-5 nm, 847 +/-5 nm, 850 +/-5 nm, 867 +/-5 nm, 885 +/-5 nm, 897 +/-5 nm and 901 +/-5 nm exist in the photoluminescence spectrum corresponding to the sample to be detected, judging that the sample is the attribute of the origin of Mexico;
II, if 4 characteristic peaks at 832 +/-5 nm, 847 +/-5 nm, 850 +/-5 nm and 897 +/-5 nm exist in the photoluminescence spectrum corresponding to the sample to be detected at the same time, but 2 characteristic peaks at 885 +/-5 nm and 901 +/-5 nm exist at the same time, judging the sample as the marine property of the Polo.
Example 1
After the amber sample to be detected is subjected to photoluminescence test at 405nm, as shown in FIG. 10: the spectrum has a broad absorption peak at 550nm, and the amber sample is preliminarily judged to be a Boragian coastal area or a Mexico origin. Photoluminescence measurements were then performed at 532nm, as shown in figure 11: the spectrogram has no characteristic peak at 577 + -5 nm, 583 + -5 nm and 630 + -5 nm, and the producing area cannot be determined. The photoluminescence test was again performed at 785nm as shown in figure 12: the amber sample is determined to be a porcellian area by the existence of characteristic peaks at 885.45nm and 901.50nm in the spectrogram.
Example 2
After the photoluminescence test at 405nm, the amber sample to be tested was as shown in fig. 13: the characteristic peak exists at 447.64nm of the spectrogram, a wide absorption peak exists at 508.90nm of the spectrogram, and the amber sample is preliminarily determined to be Burma or Dornica republic. Then, the ultraviolet-visible diffuse reflection test is performed, as shown in fig. 14: the amber sample is determined to be the Dornica republic of China by the existence of an absorption peak at 461.18nm and an absorption inflection point at 495.00 nm.
Claims (10)
1. A method of identifying a source of amber, comprising the steps of:
s1, carrying out photoluminescence spectrum test on an amber sample at an excitation wavelength of 405nm, and preliminarily judging the amber production area according to a characteristic peak or wide absorption band result obtained by the test;
and S2, respectively carrying out ultraviolet visible diffuse reflection or photoluminescence qualitative test for 1 to 2 times on different results according to the initial judgment result of the S1, and determining the amber production area according to the characteristic peak, absorption band or absorption inflection point result obtained by the test.
2. The method of identifying a producing area of amber according to claim 1,
the preliminary judgment method of the amber production area in the step S1 comprises the following steps:
when characteristic peaks or wide absorption bands exist at 444 +/-5 nm and 509 +/-5 nm, determining as Burma or the dominican republic of China; when a characteristic peak or a wide absorption band exists at 550 ± 10nm, it is judged as a polo coastal region or a mexico origin.
3. The method of identifying a producing area of amber according to claim 2,
when the origin of Burma or the Dorniaga republic is judged in the step S1, an ultraviolet visible diffuse reflection test is carried out to determine the amber origin, and the determination method comprises the following steps:
when there is an absorption peak at 460 + -5 nm and an absorption band at 495 + -5 nm, or there is an absorption peak at 460 + -5 nm and an absorption inflection point at 495 + -5 nm, it can be determined that the amber origin is the republic of dominican;
the amber origin was determined to be Burma when there was no absorption peak at 460. + -.5 nm and no absorption band at 495. + -.5 nm, or no absorption peak at 460. + -.5 nm and no absorption inflection point at 495. + -.5 nm.
4. The method of identifying a producing area of amber according to claim 2,
when the coastal region of the Borago or the origin of Mexico is judged in the step S1, a photoluminescence spectrum test is carried out under the excitation wavelength of 532nm, and the determination method comprises the following steps:
when characteristic peaks exist at 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm, determining that the amber production area is a Boragic sea coastal area; when characteristic peaks do not exist at 577 +/-5 nm, 583 +/-5 nm and 630 +/-5 nm simultaneously, the production area cannot be determined, and photoluminescence spectrum test needs to be carried out again at the excitation wavelength of 785 nm.
5. The method of identifying a production area of amber according to claim 4,
the specific determination method for carrying out the photoluminescence spectrum test again under the excitation wavelength of 785nm comprises the following steps:
determining the origin of amber as Mexico when there are characteristic peaks at 832 + -5 nm, 847 + -5 nm, 850 + -5 nm, 867 + -5 nm, 885 + -5 nm, 897 + -5 nm and 901 + -5 nm;
when there are no characteristic peaks simultaneously present at 832 + -5 nm, 847 + -5 nm, 850 + -5 nm, 897 + -5 nm, and there are characteristic peaks at 885 + -5 nm, 901 + -5 nm, the origin of amber is determined to be the sea of Boragina.
6. The method of identifying a producing area of amber according to claim 1,
in the step S1, when the excitation wavelength is 405nm, the collection range of the photoluminescence spectrum is 400-750nm.
7. The method of identifying a production area of amber according to claim 4,
the collection range of photoluminescence spectra is 400-750nm when the excitation wavelength is 532 nm.
8. The method for identifying a producing area of amber according to claim 4 or 5,
the collection range of photoluminescence spectra was 700-1000nm when the excitation wavelength was 785 nm.
9. The method of identifying a production area of amber according to any one of claims 1 to 8,
the amber sample diameter was greater than 10 μm.
10. The method for identifying a producing area of amber according to any one of claims 1 to 8,
the amber sample was flat on at least one side.
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| CN117388249A (en) * | 2023-10-07 | 2024-01-12 | 国家珠宝玉石首饰检验集团有限公司 | Method and device for identifying luminous pearl |
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